Choose the correct preposition: ''The library's digital archives are accessible ___ all registered members''.

• The correct sentence is: The library's digital archives are accessible to all registered members.
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• Accessible (adjective): 
English Meaning: easy to speak to or deal with/capable of being reached.
Bangla Meaning: অভিগম্য; কোনো কিছুর দ্বারা প্রভাবিত করার উপযোগী।

•  accessible এর পরে preposition 'to' বসে।

Example Sentence:
1. The conference room is accessible to attendees via a keycard system.
2. The museum has made its exhibits accessible to visually impaired visitors through audio guides.

Source:
1. merriam-webster.
2. Accessible Dictionary by Bangla Academy.